I decided to re-do my main rig and upgrade my Supreme block to full copper version.

System was used heavily for 6 months with Acid Green Feser One coolant. As there were numerous complains on Xtreme forum, I was quite curios to open my block to see if there is any goo or other crap inside.

Happy to report that my supreme is pristine clean and just oxidited (darker in color). I will post U-tube video shortly.

There was only ever some minor, and I mean like 1 piece, of "gunk" in my CPU block the first time I flushed it, but I'll admit, I didn't exactly clean/flush any of the new stuff before I installed everything. So it was probably due to that.

I use Purple feser one and have never had a problem. I also am currently using black and green in other rigs with no problems.

The one rig I made was for a friend and he gave it to me to clean a while back and it had been using the same feser one purple coolant for over a year and a bit.. It was completly clean and gunk free..

I switched to using distilled water only with primochill tubing (supposedly has pre-applied biocide in the tubings).. since I've been hearing this thing about Feser liquid is corrosive and damage your stuff.. So it's a relief to know, nothing is wrong with it..

Although, I did use one bottle of the UV pre-mixed coolant before, and found nothing like gunk or dirt in my blocks when I drained my loop, except for the cpu block internals needed to be washed to take of the blue color.. Even the liquid that I drained was pure blue, and no dirt..

When I got my feaser UV red coolant I noticed in the bottle before opening that there was some junk like dust bunnies floating in the liquid. I just used a coffee maker filter to clean it out and so far no issues.

Feel free to make your own video then. If he staged it he would of had to take apart the block, clean it all out and put it back together then dripped some liquid back into it. It seems like a lot of effort to do when I doubt he's on Feser's payroll.

I too have used Feser One for easily 6 months, probably closer to a year now. Only gunk I had was after the first month or so when I drained it, but I'm fairly sure that was my fault of not exactly cleaning anything out. I try and drain it every 6 months though, and typically I have something new by then anyways